What is a Concrete Water-Reducing Agent?
Water reducing agent is an important part of concrete blends. It improves the flow of concrete, rendering it simpler to blend and pour, thus improving the manageability of concrete for building.
The quantity of water-reducing additive is impacted by factors including particle size and compressive strength, among others, in relation to the performance of concrete, and its quantity is also affected by the environmental conditions and building requirements. Proper utilization of water-reducing agents can improve the consistency of concrete, minimize concrete breaking, and boost the strength of concrete. The purpose of water-reducing agents also includes decreasing the water content of concrete, enhancing the durability of concrete, and boosting the overall performance of concrete. Additionally, water-reducing agents can minimize dust creation, diminish concrete shrinkage, enhance concrete longevity, boost the appearance of concrete, and improve concrete’s capability to corrosion.
What are the characteristics of concrete water-reducing agent?
The concrete water-reducing agent is an additive that decreases the water utilization of concrete while keeping its fluidity fundamentally unchanged, therefore enhancing the robustness and resilience of concrete, or raising the fluidity of concrete and enhancing the workability of concrete within the same cement dosage and water-cement ratio.
1. Greasing effect.
The polar hydrophilic groups in the water-reducing agent orient themselves to adsorb onto the surface of cement particles and easily bond to water molecules through hydrogen bonds. The strength of this hydrogen bonding is much higher than the molecular attraction between water molecules and cement particles. When ample water-reducing agent is absorbed by the cement particles, with the assistance of R-SO3θ and the hydrogen bonding in water molecules, as well as the hydrogen bonding between water molecules, a stable solvated water film creates on the surface of cement particles. This coating serves as a three-dimensional protective layer, preventing direct contact between cement particles and functioning as a lubricant between particles.
2. Wetting effect.
After cement and water are mixed, the surface of the particles is moistened by water, and the factors of wetting have a significant impact on the effectiveness of fresh industrial concrete. The lowering in surface available energy induced by naturally occurring wetting can be calculated using the formula suggested by Glbbs.
3. Water-reducing effect.
After the addition of high-efficiency water-reducing agents in industrial concrete, the water-cement ratio can be considerably lowered while preserving fluidity. High-efficiency water-reducing agents have a water reduction rate of up to 10% to 25%, while regular water-reducing agents have a water reduction rate of 5% to 15%, thus the name high-efficiency water-reducing agent. The water reduction effect is mainly attributed to the adsorption and diffusion of water-reducing agents in commercial concrete.
4. Plasticity-Enhancing effect.
After adding a water-reducing additive to concrete, it can raise the fluidness while maintaining the water-cement ratio unchanged. Common water-reducing agents, in the event of keeping the precise same volume of cement, can produce the brand-new industrial concrete depression rise by more than 10cm; high-performance water-reducing agents can create a slump of 25cm of industrial concrete.
Concrete water-reducing agent process of action presented
1. Distributing effect:
After the concrete is combined with water, due to the hydration of cement particles, the surface of cement particles creates a twofold electrical layer structure, leading to the development of a solvent water film and asymmetrical charged surfaces between cement particles creating a bridging effect. This guarantees that 10% to 30% of the blend water is covered by the concrete particles and cannot take part in free flow and lubrication, thus influencing the workability of the concrete mix. Whenever the water-reducing additive is added, the water-reducing agent molecules can orient themselves and adsorb on the surface of cement particles, creating a likewise charged surface (typically negative) on the cement particles. This triggers electrostatic repulsion, prompting the cement particles to disperse from each other, disintegrating the bridging structure, and releasing the enveloped water. As a result, the water can flow more efficiently, thus increasing the fluidity of the concrete mix.
2. Lubrication impact:
The hydrophilic group in the water-reducing agent is highly polar, enabling the adsorption film of the water-reducing substance on the surface of cement particles to generate a steady layer of solventized water film along with water molecules. This water film offers efficient lubrication, considerably lowering the resistance between cement particles and furthermore enhancing the flow of concrete.
3. Spatial site-resistance effect:
The water-reducing additive structure with hydrophilic branched chains expands in a liquid mixture, developing a compact hydrophilic three-dimensional adsorption film on the surface of adsorbed cement particles. When the concrete particles are near to each other, the adsorption layers start to overlap. This causes in spatial site-resistance amongst cement particles, enhancing the repulsion of spatial site-resistance and improving the bonding obstruction between cement particles, thus maintaining the desired slump of the concrete.
4. Slow-release impact of graft copolymerization branched chains:
New water-reducing agents, such as polycarboxylic acid water-reducing agents, possess branching chains implanted onto the molecules of the water-reducing agent. These branched chains provide both spatial site-resistance effects and, in the highly alkaline environment of cement hydration, can be slowly emitted, resulting in the release of polycarboxylic acid with dispersing impact. This enhances the scattering effect of cement particles and regulates slump loss.
The amount of water-reducing additive is affected by the particulate size as well as compressive strength, etc., on the performance of concrete, and furthermore its amount is also impacted by climatic problems and construction requirements. The correct use of water-reducing agents can boost the uniformity of concrete, reduce the fracturing of the concrete, izajoo likewise increase the resilience of concrete. The function of water-reducing agents furthermore consists of decreasing the water material of concrete, which increases the durability of concrete and makes the general performance of concrete top-quality. Additionally, water-reducing agents can likewise reduce the development of dirt, reduce the shrinking of concrete, increase the durability of concrete, improve the look of concrete, and enhance the oxidation resistance of concrete.
Cement Water-Reducing Vendor
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